Light gluino and the running ofαs

Cheng-Wei Chiang, Zumin Luo, Jonathan L. Rosner
2003 Physical Review D, Particles and fields  
A gluino in the mass range 12--16 GeV combined with a light (2--5.5 GeV) bottom squark, as has been proposed recently to explain an excess of b quark hadroproduction, would affect the momentum-scale dependence ("running") of the strong coupling constant alpha_s in such a way as to raise its value at M_Z by about 0.014 +/- 0.001. If one combines sources of uncertainty at low (m_b) and high (M_Z) mass scales, one can only distinguish such an effect at slightly more than the 2 sigma level.
more » ... igma level. Prospects for improvement in this situation, which include better lattice QCD simulations and better measurements at M_Z, are discussed.
doi:10.1103/physrevd.67.035008 fatcat:cwq22sswincsxgprp342fgqv6u